Improved rock-drill



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NAPETERS, FHOTUMTHOGRAPHER. wASHlNGTON. D. c.

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TheSchedule referred to in these Letters Patent and making part of the same.

To all whom it may concern-.-

' Be it known that I, OHARLns H. DAY/1s, ofthe city of Troy, in the county `of Rensselaer, and State of NewYork, have invented certain new and useful lmprovements'in Rock-Drilling Machines; and I do hereby declare that-the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, and the letters of reference marked thereon,forming a part of this specification, inv which- 11 Figure l is a perspective view ofthe improved ma c ine;

Figure 2 isa longitudinal vertical section of the same, and also showing it as arranged in position for operation in a quarry;

Figure 3 is a vertical transverse section, takenl at the line x x of g. 2; and

Figure 4 is a view of the under side of the carriage below the standards.

rlhe same letters refer to like parts in each of the said figures.

In the operation of quarrying marble and other rock or stone, after the back and `end-sides of the intended block of marble or stone have been separated 'om the ledge or quarry, by the usual process of channelling, the intended block of stone is then to be wedged or gadded out from the ledge, which is done by drilling, by hand, a series of horizontal, or nearly so, gaddingholes at the base* of the intended block of stone, and then driving thereinto a series of wedges, which thus splits, or gads the block out of the ledge. l

The object of my invention is to make an improved rock-drilling machine, or a machine for gaddrilling;

' that is to say,rav1nachinethat shall drill horizontally into rock at the base of the intended block of stone, in a more expeditions and economical manner than is done by hand, such a series of wedging, or gadding holes as is required for separating the base of the block of stone from the ledge; and

The said invention consists in the combination and arrangement of certain mechanical devices for actu'- ating the drill-shaft, so as to alternately and successively draw it back, rotate, and drive it; and

It also consists in the arrangement of the drill-shaft at the under side of its movable carriage and actuating-devices, in a horizontal position, and so as to be operated therein close to the bed or face of the rock, in the manner as hereinafter fully described and shown, for the purpose of drilling a series of wedging, or gaddingout holes at the base of the block of stone to be separated from the ledge or quarry.

'lo enable others skilled in the art to construct and use my improved rock-drilling machine, I new proceed to fully describe its construction and operation, as fol- A A is a timber vframe for supporting the n^ whine-ry.

Within this frame is arranged a sliding, ormovable carriage, B B, providedwith an upright frame,4 or standards, C O, which supports the driving-shaft and drivingwheel H, below which wheel there is a cross-bar, I, afiixed to the standards C C, and supporting the upright shaft and pinion N, which gears with the wheel H, as shown. i

To the upright shaft of pinion N, and at its lower end, is aiixed the grooved, or hollow cam E, in manf ner as shown, and so as to rotate with its hollow side close down to the face-plate D on the movable carriage B B.

At the under side of the supporting-frame A A, and its movable carriage B B, there is arranged thereunder, and s o as to operate in a horizontal position, the rock-drill shaft G, which is supported thereat in suitable boxes, bolted to the aforesaid frame and carriage, and which permits the drill-shaft G to move reciprocally endwise therein.

Aiiixed to the drill-shaft is the draw-back arm b, which is secured in adjusted position thereon, by the set-screw collars m and n, as shown.

A ratchet-wheel, c, is adjusted o n `the drill-shaft in a manner so as to allow the shaft to slide through it; the ratchetewheel c being so attached to the shaft G, by a feather d, that when rotated, it turns the drillshaft with it.

a is the ratchet-wheel arm, attached to the ratchet, so as to move backward thereon without moving the ratchetwheel, and' carrying a pawl, which, in the forward movement of the arm a, turns the ratchet.

The back motion of arm a. is given by a spring, i, arranged as shown.

These arms a and b, respectively, of the drill-shaft G, project upward through slots in the face-plate D, and they are, respectively, so arranged, relatively to the cam E, as to be within and under its circle of operation, described while in rotation, so that the V said grooved, or hollow cam E shall, in its rotation, so act on'- the'arms a ,and b aforesaid, as to alternately and successively draw back and rotate 'the drill-shaft G, before the cam uncovers and releases the arm b, which, when released, allows the coil-spring h, which is attached to the drill-shaft G, in manner substantially as shown, to expand, and thus drive or operate the drill.

By the use of a hollow, or grooved cam, E, i'or drawing the drill-shaft back, when it is driven by a spring, h, as shown, a great advantage is thereby gained, because the leverage brought to bear in turning the cam is increased proportionally to the increasing resistance to` compression ofthe spring h, as the drill-shaft is drawn back for another stroke, for, as the cam rotates over the arm b, it brings its acting-face nearer its een tre, and so increasing the leverage of the power applied to drive it. Hence the machine can be run fast, steadily, and easily, without jerking or straining it.

The dril1-shaft G is fed to its work in Vmanner substantially as follows:

Upon the frame A A is affixed a rack, K, and upon the movable carriage B B is aihxed an upright shaft, with a hand-Wheel, J, and a pinion', e, gearing -With rack K, and so as to'feed the drill-shaft G by hand, when desired.

The drll-shaft G is also made self-feeding, by the arrangement and combination with it of the following devices, substantially:

Upon the drill-shaft is affixed a feeding-bar, j, (see iig. 4,) which, in the endwise motion of the shaft, at each successive stroke thereof', acts on the feeding-bar k, so as to move it endwise, to thereby cause the pawl f, pivoted thereto, to act on the pinion e, so as to turn it sufficiently in the rack K to feed the drill properly at each of its successive strokes.

A spring, g, acts on the pawl f,to keep it on the pinion e; and a spring, l, attached to the feeding-bar, with its free-end acting on the carriage B B, in manner as shown, serves to keep the feed-bar in operative contact or position with the feeding-arm j.

This improved rock-drilling machineis used by arranging it in working-position on a quarry-ledge, Z Z, in manner as shown in lig. 2 of the annexed drawings, with its drill-shaft G along close to the ledge or face of the rock, and' with its drill-point at the base of the block of stone, Y, whereat a series of Wedging, or gaddingont holes vis to be drilled. The machineframe is kept in fixed position on the ledge by dogs, or braces x. Power being now appliedI at the crank, or.wheel L, the drill G is operated in-manner as hereinbefore described. After one hole of the series is drilled, the machine is then shifted into position for drilling thefnext hole, and so on,-nnti1 the series of holes is completed.

eases arrangement, respectively, of said drill-shafts drawback arm 11 and paWl-arrn a, in such relative position to each other, and to the hollow, or grooved cam E, in

manner as described, that the said cam, in its rotations, actuates, respectively and alternately, the said arms b and a, and thereby snccessivelydraws back andA then rotates said drill-shaft G, in manner as set forth.

2. In combination Withthe supporting-frame A A, and its horizontallyfmovable carriage B B, with the drills actuating-machinery, the arrangement of the endwise-reciprocating and rotating drill-shaft G, at the under, or bottom side thereof', so as to he operated thereat in a horizontal position or close to the rock, in the manner substantiallyfas herein shown and set forth.

3. The combination and arrangement of the drivingwheel H,'pinion N, hollow, or grooved earn E, drawback arm b, pawl-arln a, ratchet-Wheel c, driving-spring h, .with the movable carriage B B, frame A A, and the rock-drill shaft G, as arranged in horizontal position thereunder, in manner substantially as described and shown, so as to operate or rotate and move reciprocally the said rock-drill, in manner as and for the purposes set forth.

- CHARLES H. DAVIS. Witnesses:

J. J. SAVAGE, RICHARD PREsoo'rT. 

